Cleaning steps set the work function and band bending of air-exposed GaN surfaces over a range larger than 1 eV, and UV light reduces the work function of HCl-treated GaN by altering the surface dipole.
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Electronic properties of air-exposed GaN$(1\bar{1}00)$ and $(0001)$ surfaces after several device processing compatible cleaning steps
Cleaning steps set the work function and band bending of air-exposed GaN surfaces over a range larger than 1 eV, and UV light reduces the work function of HCl-treated GaN by altering the surface dipole.